光学学报, 2017, 37 (6): 0616001, 网络出版: 2017-06-08
二维平板光子晶体的等效负折射率测量 下载: 822次
Measurement of Effective Negative Refractive Index of Two-Dimensional Photonic Crystal Slabs
材料 光子晶体 负折射 等频图 测量 materials photonic crystal negative refraction equi-frequency contour measurement
摘要
光子晶体特殊的色散特性能导致负折射现象发生。用波束位移法对二维光子晶体平板的负折射现象进行理论计算和实验测量, 得到了入射光经平板光子晶体折射后的二维光场分布。测量结果表明, 横电(TE)光在光子晶体中发生负折射, 出射光沿出射面产生了反方向的横向位移, 由此计算出来的负折射率约为-0.44, 而横磁(TM)光没有发生负折射。实验结果与仿真结果吻合较好。
Abstract
Photonic crystals have a special dispersion characteristic, which can lead to negative refraction. The negative refraction of a two-dimensional photonic crystal slab is calculated theoretically and measured experimentally with the beam-displacement method. The two-dimensional field distribution for an incident light refracted by this photonic crystal slab is obtained. The measured result shows that, as for the transverse electric (TE) light, the negative refraction in photonic crystals and the horizontal displacement in the opposite direction for the light exiting along the exit surface occur, and thus the effective refractive index is calculated as -0.44. In contrast, as for a transverse magnetic (TM) light, the negative refraction does not happen at all. The experimental result is well consistent with the simulated one.
蒋强, 陈家璧, 梁斌明, 王燕, 庄松林. 二维平板光子晶体的等效负折射率测量[J]. 光学学报, 2017, 37(6): 0616001. Jiang Qiang, Chen Jiabi, Liang Binming, Wang Yan, Zhuang Songlin. Measurement of Effective Negative Refractive Index of Two-Dimensional Photonic Crystal Slabs[J]. Acta Optica Sinica, 2017, 37(6): 0616001.